I asked this question many years ago on a Usenet group, and the answer was along the lines of what we’re seeing is many millions of years after those orbits began, and that they all eventually flatten out due to the gravity of the other objects in orbit.
So you could have 2 objects at roughly the same orbital distance but perpendicular to one another (eg. one orbiting the star’s poles and the other around it’s equator), and over time the small amount of gravitational force they exert on one another will bring them roughly into the same plane.
Hopefully someone better versed in the topic can come along to explain it better than I can.
To add to what others have replied, Amazon have an institutional belief that everyone who makes it through the Loop is better than 50% of existing staff.
It could be post-hoc rationalising of back-loaded share vesting, hire-to-fire, and their other many practices, but that’s the position. With that kind of thinking, it makes this behaviour, including it’s consequences, a no-brainer win:win to them.